Inverted telephoto type super-wide angle lens

Details Inverted telephoto type super-wide angle lens Inverted telephoto type super-wide angle lens

1977-08-22

1979-06-19

Sacher, Paul A.

G02B 964

Patent

active

041584821

ABSTRACT:
An inverted telephoto lens having a super-wide angle of view is composed of a negative meniscus lens L1 convex to the front as numbered consecutively from front to rear, a biconvex lens L2, a negative meniscus lens L3 convex to the front, a cemented positive doublet of a negative lens L4 and a positive lens L5, a biconvex lens L6, a biconcave lens L7 the rear surface of which has radius of curvature greater than that of the front surface thereof, a positive meniscus lens L8 convex to the rear, and a positive lens L9 arranged in this order. The Abbe dispersion number of the biconvex lens L6 is more than 53 and less than 61. The difference between the Abbe number of the negative lens L4 and that of the positive lens L5 of the doublet is more than 10 and less than 16.

REFERENCES:
patent: 3736049 (1973-05-01), Shimizu
patent: 3958864 (1976-05-01), Glatzel

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